The Takedown Pin is located at the rear of the lower receiver, near the buffer tube, and assists the pivot pin in securing the upper and lower receivers together.

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Exposing the interior of the AR-15 by removing the Takedown Pin

Once removed, the takedown pin allows the upper receiver to pivot on the front pin, while exposing the interior parts of the AR-15.

Takedown pin

The takedown pin can be installed in conjunction with the takedown detent pin and takedown detent spring